##Sample Implementation of ratating a matrix.
- rotate a matrix clockwise
- only rotate one step, not 90 degree
1, 2, 3
4, 5, 6
7, 8, 9
4, 1, 2
7, 5, 3
8, 9, 6
1, 2, 3, 4
5, 6, 7, 8
9, 10, 11, 12
13, 14, 15, 16
5, 1, 2, 3
9, 10, 6, 4
13, 11, 7, 8
14, 15, 16, 12